options.c

   1 /*
   2  * firewall3 - 3rd OpenWrt UCI firewall implementation
   3  *
   4  *   Copyright (C) 2013-2014 Jo-Philipp Wich <jo@mein.io>
   5  *
   6  * Permission to use, copy, modify, and/or distribute this software for any
   7  * purpose with or without fee is hereby granted, provided that the above
   8  * copyright notice and this permission notice appear in all copies.
   9  *
  10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  13  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  14  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  15  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  16  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  17  */
  18
  19 #include "options.h"
  20 #include "ubus.h"
  21
  22
  23 static bool
  24 put_value(void *ptr, void *val, int elem_size, bool is_list)
  25 {
  26         void *copy;
  27
  28         if (is_list)
  29         {
  30                 copy = malloc(elem_size);
  31
  32                 if (!copy)
  33                         return false;
  34
  35                 memcpy(copy, val, elem_size);
  36                 list_add_tail((struct list_head *)copy, (struct list_head *)ptr);
  37                 return true;
  38         }
  39
  40         memcpy(ptr, val, elem_size);
  41         return false;
  42 }
  43
  44 static bool
  45 parse_enum(void *ptr, const char *val, const char **values, int min, int max)
  46 {
  47         int i, l = strlen(val);
  48
  49         if (l > 0)
  50         {
  51                 for (i = 0; i <= (max - min); i++)
  52                 {
  53                         if (!strncasecmp(val, values[i], l))
  54                         {
  55                                 *((int *)ptr) = min + i;
  56                                 return true;
  57                         }
  58                 }
  59         }
  60
  61         return false;
  62 }
  63
  64
  65 const char *fw3_flag_names[__FW3_FLAG_MAX] = {
  66         "filter",
  67         "nat",
  68         "mangle",
  69         "raw",
  70
  71         "IPv4",
  72         "IPv6",
  73
  74         "ACCEPT",
  75         "REJECT",
  76         "DROP",
  77         "NOTRACK",
  78         "HELPER",
  79         "MARK",
  80         "DNAT",
  81         "SNAT",
  82         "MASQUERADE",
  83
  84         "ACCEPT",
  85         "REJECT",
  86         "DROP",
  87 };
  88
  89 const char *fw3_limit_units[__FW3_LIMIT_UNIT_MAX] = {
  90         "second",
  91         "minute",
  92         "hour",
  93         "day",
  94 };
  95
  96 const char *fw3_ipset_method_names[__FW3_IPSET_METHOD_MAX] = {
  97         "(bug)",
  98         "bitmap",
  99         "hash",
 100         "list",
 101 };
 102
 103 const char *fw3_ipset_type_names[__FW3_IPSET_TYPE_MAX] = {
 104         "(bug)",
 105         "ip",
 106         "port",
 107         "mac",
 108         "net",
 109         "set",
 110 };
 111
 112 static const char *weekdays[] = {
 113         "monday",
 114         "tuesday",
 115         "wednesday",
 116         "thursday",
 117         "friday",
 118         "saturday",
 119         "sunday",
 120 };
 121
 122 static const char *include_types[] = {
 123         "script",
 124         "restore",
 125 };
 126
 127 static const char *reflection_sources[] = {
 128         "internal",
 129         "external",
 130 };
 131
 132
 133 bool
 134 fw3_parse_bool(void *ptr, const char *val, bool is_list)
 135 {
 136         if (!strcmp(val, "true") || !strcmp(val, "yes") || !strcmp(val, "1"))
 137                 *((bool *)ptr) = true;
 138         else
 139                 *((bool *)ptr) = false;
 140
 141         return true;
 142 }
 143
 144 bool
 145 fw3_parse_int(void *ptr, const char *val, bool is_list)
 146 {
 147         char *e;
 148         int n = strtol(val, &e, 0);
 149
 150         if (e == val || *e)
 151                 return false;
 152
 153         *((int *)ptr) = n;
 154
 155         return true;
 156 }
 157
 158 bool
 159 fw3_parse_string(void *ptr, const char *val, bool is_list)
 160 {
 161         *((char **)ptr) = (char *)val;
 162         return true;
 163 }
 164
 165 bool
 166 fw3_parse_target(void *ptr, const char *val, bool is_list)
 167 {
 168         return parse_enum(ptr, val, &fw3_flag_names[FW3_FLAG_ACCEPT],
 169                           FW3_FLAG_ACCEPT, FW3_FLAG_MASQUERADE);
 170 }
 171
 172 bool
 173 fw3_parse_limit(void *ptr, const char *val, bool is_list)
 174 {
 175         struct fw3_limit *limit = ptr;
 176         enum fw3_limit_unit u = FW3_LIMIT_UNIT_SECOND;
 177         char *e;
 178         int n;
 179
 180         if (*val == '!')
 181         {
 182                 limit->invert = true;
 183                 while (isspace(*++val));
 184         }
 185
 186         n = strtol(val, &e, 10);
 187
 188         if (errno == ERANGE || errno == EINVAL)
 189                 return false;
 190
 191         if (*e && *e++ != '/')
 192                 return false;
 193
 194         if (!strlen(e))
 195                 return false;
 196
 197         if (!parse_enum(&u, e, fw3_limit_units, 0, FW3_LIMIT_UNIT_DAY))
 198                 return false;
 199
 200         limit->rate = n;
 201         limit->unit = u;
 202
 203         return true;
 204 }
 205
 206 bool
 207 fw3_parse_device(void *ptr, const char *val, bool is_list)
 208 {
 209         char *p;
 210         struct fw3_device dev = { };
 211
 212         if (*val == '*')
 213         {
 214                 dev.set = true;
 215                 dev.any = true;
 216                 put_value(ptr, &dev, sizeof(dev), is_list);
 217                 return true;
 218         }
 219
 220         if (*val == '!')
 221         {
 222                 dev.invert = true;
 223                 while (isspace(*++val));
 224         }
 225
 226         if ((p = strchr(val, '@')) != NULL)
 227         {
 228                 *p++ = 0;
 229                 snprintf(dev.network, sizeof(dev.network), "%s", p);
 230         }
 231
 232         if (*val)
 233                 snprintf(dev.name, sizeof(dev.name), "%s", val);
 234         else
 235                 return false;
 236
 237         dev.set = true;
 238         put_value(ptr, &dev, sizeof(dev), is_list);
 239         return true;
 240 }
 241
 242 bool
 243 fw3_parse_address(void *ptr, const char *val, bool is_list)
 244 {
 245         struct fw3_address addr = { };
 246         struct in_addr v4;
 247         struct in6_addr v6;
 248         char *p = NULL, *m = NULL, *s, *e;
 249         int bits = -1;
 250
 251         if (*val == '!')
 252         {
 253                 addr.invert = true;
 254                 while (isspace(*++val));
 255         }
 256
 257         s = strdup(val);
 258
 259         if (!s)
 260                 return false;
 261
 262         if ((m = strchr(s, '/')) != NULL)
 263                 *m++ = 0;
 264         else if ((p = strchr(s, '-')) != NULL)
 265                 *p++ = 0;
 266
 267         if (inet_pton(AF_INET6, s, &v6))
 268         {
 269                 addr.family = FW3_FAMILY_V6;
 270                 addr.address.v6 = v6;
 271
 272                 if (m)
 273                 {
 274                         if (!inet_pton(AF_INET6, m, &v6))
 275                         {
 276                                 bits = strtol(m, &e, 10);
 277
 278                                 if ((*e != 0) || !fw3_bitlen2netmask(addr.family, bits, &v6))
 279                                         goto fail;
 280                         }
 281
 282                         addr.mask.v6 = v6;
 283                 }
 284                 else if (p)
 285                 {
 286                         if (!inet_pton(AF_INET6, p, &addr.mask.v6))
 287                                 goto fail;
 288
 289                         addr.range = true;
 290                 }
 291                 else
 292                 {
 293                         memset(addr.mask.v6.s6_addr, 0xFF, 16);
 294                 }
 295         }
 296         else if (inet_pton(AF_INET, s, &v4))
 297         {
 298                 addr.family = FW3_FAMILY_V4;
 299                 addr.address.v4 = v4;
 300
 301                 if (m)
 302                 {
 303                         if (!inet_pton(AF_INET, m, &v4))
 304                         {
 305                                 bits = strtol(m, &e, 10);
 306
 307                                 if ((*e != 0) || !fw3_bitlen2netmask(addr.family, bits, &v4))
 308                                         goto fail;
 309                         }
 310
 311                         addr.mask.v4 = v4;
 312                 }
 313                 else if (p)
 314                 {
 315                         if (!inet_pton(AF_INET, p, &addr.mask.v4))
 316                                 goto fail;
 317
 318                         addr.range = true;
 319                 }
 320                 else
 321                 {
 322                         addr.mask.v4.s_addr = 0xFFFFFFFF;
 323                 }
 324         }
 325         else
 326         {
 327                 goto fail;
 328         }
 329
 330         free(s);
 331         addr.set = true;
 332         put_value(ptr, &addr, sizeof(addr), is_list);
 333         return true;
 334
 335 fail:
 336         free(s);
 337         return false;
 338 }
 339
 340 bool
 341 fw3_parse_network(void *ptr, const char *val, bool is_list)
 342 {
 343         struct fw3_device dev = { };
 344         struct fw3_address *addr, *tmp;
 345         LIST_HEAD(addr_list);
 346         int n_addrs;
 347
 348         if (!fw3_parse_address(ptr, val, is_list))
 349         {
 350                 if (!fw3_parse_device(&dev, val, false))
 351                         return false;
 352
 353                 n_addrs = fw3_ubus_address(&addr_list, dev.name);
 354
 355                 list_for_each_entry(addr, &addr_list, list)
 356                 {
 357                         addr->invert = dev.invert;
 358                         addr->resolved = true;
 359                 }
 360
 361                 /* add an empty address member with .set = false, .resolved = true
 362                  * to signal resolving failure to callers */
 363                 if (n_addrs == 0)
 364                 {
 365                         tmp = fw3_alloc(sizeof(*tmp));
 366                         tmp->resolved = true;
 367
 368                         list_add_tail(&tmp->list, &addr_list);
 369                 }
 370
 371                 if (is_list)
 372                 {
 373                         list_splice_tail(&addr_list, ptr);
 374                 }
 375                 else if (!list_empty(&addr_list))
 376                 {
 377                         memcpy(ptr, list_first_entry(&addr_list, typeof(*addr), list),
 378                                sizeof(*addr));
 379
 380                         list_for_each_entry_safe(addr, tmp, &addr_list, list)
 381                                 free(addr);
 382                 }
 383         }
 384
 385         return true;
 386 }
 387
 388 bool
 389 fw3_parse_mac(void *ptr, const char *val, bool is_list)
 390 {
 391         struct fw3_mac addr = { };
 392         struct ether_addr *mac;
 393
 394         if (*val == '!')
 395         {
 396                 addr.invert = true;
 397                 while (isspace(*++val));
 398         }
 399
 400         if ((mac = ether_aton(val)) != NULL)
 401         {
 402                 addr.mac = *mac;
 403                 addr.set = true;
 404
 405                 put_value(ptr, &addr, sizeof(addr), is_list);
 406                 return true;
 407         }
 408
 409         return false;
 410 }
 411
 412 bool
 413 fw3_parse_port(void *ptr, const char *val, bool is_list)
 414 {
 415         struct fw3_port range = { };
 416         uint16_t n;
 417         uint16_t m;
 418         char *p;
 419
 420         if (*val == '!')
 421         {
 422                 range.invert = true;
 423                 while (isspace(*++val));
 424         }
 425
 426         n = strtoul(val, &p, 10);
 427
 428         if (errno == ERANGE || errno == EINVAL)
 429                 return false;
 430
 431         if (*p && *p != '-' && *p != ':')
 432                 return false;
 433
 434         if (*p)
 435         {
 436                 m = strtoul(++p, NULL, 10);
 437
 438                 if (errno == ERANGE || errno == EINVAL || m < n)
 439                         return false;
 440
 441                 range.port_min = n;
 442                 range.port_max = m;
 443         }
 444         else
 445         {
 446                 range.port_min = n;
 447                 range.port_max = n;
 448         }
 449
 450         range.set = true;
 451         put_value(ptr, &range, sizeof(range), is_list);
 452         return true;
 453 }
 454
 455 bool
 456 fw3_parse_family(void *ptr, const char *val, bool is_list)
 457 {
 458         if (!strcmp(val, "any") || !strcmp(val, "*"))
 459                 *((enum fw3_family *)ptr) = FW3_FAMILY_ANY;
 460         else if (!strcmp(val, "inet") || strrchr(val, '4'))
 461                 *((enum fw3_family *)ptr) = FW3_FAMILY_V4;
 462         else if (!strcmp(val, "inet6") || strrchr(val, '6'))
 463                 *((enum fw3_family *)ptr) = FW3_FAMILY_V6;
 464         else
 465                 return false;
 466
 467         return true;
 468 }
 469
 470 bool
 471 fw3_parse_icmptype(void *ptr, const char *val, bool is_list)
 472 {
 473         struct fw3_icmptype icmp = { };
 474         bool v4 = false;
 475         bool v6 = false;
 476         char *p;
 477         int i;
 478
 479         for (i = 0; i < ARRAY_SIZE(fw3_icmptype_list_v4); i++)
 480         {
 481                 if (!strcmp(val, fw3_icmptype_list_v4[i].name))
 482                 {
 483                         icmp.type     = fw3_icmptype_list_v4[i].type;
 484                         icmp.code_min = fw3_icmptype_list_v4[i].code_min;
 485                         icmp.code_max = fw3_icmptype_list_v4[i].code_max;
 486
 487                         v4 = true;
 488                         break;
 489                 }
 490         }
 491
 492         for (i = 0; i < ARRAY_SIZE(fw3_icmptype_list_v6); i++)
 493         {
 494                 if (!strcmp(val, fw3_icmptype_list_v6[i].name))
 495                 {
 496                         icmp.type6     = fw3_icmptype_list_v6[i].type;
 497                         icmp.code6_min = fw3_icmptype_list_v6[i].code_min;
 498                         icmp.code6_max = fw3_icmptype_list_v6[i].code_max;
 499
 500                         v6 = true;
 501                         break;
 502                 }
 503         }
 504
 505         if (!v4 && !v6)
 506         {
 507                 i = strtoul(val, &p, 10);
 508
 509                 if ((p == val) || (*p != '/' && *p != 0) || (i > 0xFF))
 510                         return false;
 511
 512                 icmp.type = i;
 513
 514                 if (*p == '/')
 515                 {
 516                         val = ++p;
 517                         i = strtoul(val, &p, 10);
 518
 519                         if ((p == val) || (*p != 0) || (i > 0xFF))
 520                                 return false;
 521
 522                         icmp.code_min = i;
 523                         icmp.code_max = i;
 524                 }
 525                 else
 526                 {
 527                         icmp.code_min = 0;
 528                         icmp.code_max = 0xFF;
 529                 }
 530
 531                 icmp.type6     = icmp.type;
 532                 icmp.code6_min = icmp.code_max;
 533                 icmp.code6_max = icmp.code_max;
 534
 535                 v4 = true;
 536                 v6 = true;
 537         }
 538
 539         icmp.family = (v4 && v6) ? FW3_FAMILY_ANY
 540                                  : (v6 ? FW3_FAMILY_V6 : FW3_FAMILY_V4);
 541
 542         put_value(ptr, &icmp, sizeof(icmp), is_list);
 543         return true;
 544 }
 545
 546 bool
 547 fw3_parse_protocol(void *ptr, const char *val, bool is_list)
 548 {
 549         struct fw3_protocol proto = { };
 550         struct protoent *ent;
 551         char *e;
 552
 553         if (*val == '!')
 554         {
 555                 proto.invert = true;
 556                 while (isspace(*++val));
 557         }
 558
 559         if (!strcmp(val, "all") || !strcmp(val, "any") || !strcmp(val, "*"))
 560         {
 561                 proto.any = true;
 562                 put_value(ptr, &proto, sizeof(proto), is_list);
 563                 return true;
 564         }
 565         else if (!strcmp(val, "icmpv6"))
 566         {
 567                 val = "ipv6-icmp";
 568         }
 569         else if (!strcmp(val, "tcpudp"))
 570         {
 571                 proto.protocol = 6;
 572                 if (put_value(ptr, &proto, sizeof(proto), is_list))
 573                 {
 574                         proto.protocol = 17;
 575                         put_value(ptr, &proto, sizeof(proto), is_list);
 576                 }
 577
 578                 return true;
 579         }
 580
 581         ent = getprotobyname(val);
 582
 583         if (ent)
 584         {
 585                 proto.protocol = ent->p_proto;
 586                 put_value(ptr, &proto, sizeof(proto), is_list);
 587                 return true;
 588         }
 589
 590         proto.protocol = strtoul(val, &e, 10);
 591
 592         if ((e == val) || (*e != 0))
 593                 return false;
 594
 595         put_value(ptr, &proto, sizeof(proto), is_list);
 596         return true;
 597 }
 598
 599 bool
 600 fw3_parse_ipset_method(void *ptr, const char *val, bool is_list)
 601 {
 602         return parse_enum(ptr, val, &fw3_ipset_method_names[FW3_IPSET_METHOD_BITMAP],
 603                           FW3_IPSET_METHOD_BITMAP, FW3_IPSET_METHOD_LIST);
 604 }
 605
 606 bool
 607 fw3_parse_ipset_datatype(void *ptr, const char *val, bool is_list)
 608 {
 609         struct fw3_ipset_datatype type = { };
 610
 611         type.dir = "src";
 612
 613         if (!strncmp(val, "dest_", 5))
 614         {
 615                 val += 5;
 616                 type.dir = "dst";
 617         }
 618         else if (!strncmp(val, "dst_", 4))
 619         {
 620                 val += 4;
 621                 type.dir = "dst";
 622         }
 623         else if (!strncmp(val, "src_", 4))
 624         {
 625                 val += 4;
 626                 type.dir = "src";
 627         }
 628
 629         if (parse_enum(&type.type, val, &fw3_ipset_type_names[FW3_IPSET_TYPE_IP],
 630                        FW3_IPSET_TYPE_IP, FW3_IPSET_TYPE_SET))
 631         {
 632                 put_value(ptr, &type, sizeof(type), is_list);
 633                 return true;
 634         }
 635
 636         return false;
 637 }
 638
 639 bool
 640 fw3_parse_date(void *ptr, const char *val, bool is_list)
 641 {
 642         unsigned int year = 1970, mon = 1, day = 1, hour = 0, min = 0, sec = 0;
 643         struct tm tm = { 0 };
 644         time_t ts;
 645         char *p;
 646
 647         year = strtoul(val, &p, 10);
 648         if ((*p != '-' && *p) || year < 1970 || year > 2038)
 649                 goto fail;
 650         else if (!*p)
 651                 goto ret;
 652
 653         mon = strtoul(++p, &p, 10);
 654         if ((*p != '-' && *p) || mon > 12)
 655                 goto fail;
 656         else if (!*p)
 657                 goto ret;
 658
 659         day = strtoul(++p, &p, 10);
 660         if ((*p != 'T' && *p) || day > 31)
 661                 goto fail;
 662         else if (!*p)
 663                 goto ret;
 664
 665         hour = strtoul(++p, &p, 10);
 666         if ((*p != ':' && *p) || hour > 23)
 667                 goto fail;
 668         else if (!*p)
 669                 goto ret;
 670
 671         min = strtoul(++p, &p, 10);
 672         if ((*p != ':' && *p) || min > 59)
 673                 goto fail;
 674         else if (!*p)
 675                 goto ret;
 676
 677         sec = strtoul(++p, &p, 10);
 678         if (*p || sec > 59)
 679                 goto fail;
 680
 681 ret:
 682         tm.tm_year = year - 1900;
 683         tm.tm_mon  = mon - 1;
 684         tm.tm_mday = day;
 685         tm.tm_hour = hour;
 686         tm.tm_min  = min;
 687         tm.tm_sec  = sec;
 688
 689         ts = mktime(&tm) - timezone;
 690
 691         if (ts >= 0)
 692         {
 693                 gmtime_r(&ts, (struct tm *)ptr);
 694                 return true;
 695         }
 696
 697 fail:
 698         return false;
 699 }
 700
 701 bool
 702 fw3_parse_time(void *ptr, const char *val, bool is_list)
 703 {
 704         unsigned int hour = 0, min = 0, sec = 0;
 705         char *p;
 706
 707         hour = strtoul(val, &p, 10);
 708         if (*p != ':' || hour > 23)
 709                 goto fail;
 710
 711         min = strtoul(++p, &p, 10);
 712         if ((*p != ':' && *p) || min > 59)
 713                 goto fail;
 714         else if (!*p)
 715                 goto ret;
 716
 717         sec = strtoul(++p, &p, 10);
 718         if (*p || sec > 59)
 719                 goto fail;
 720
 721 ret:
 722         *((int *)ptr) = 60 * 60 * hour + 60 * min + sec;
 723         return true;
 724
 725 fail:
 726         return false;
 727 }
 728
 729 bool
 730 fw3_parse_weekdays(void *ptr, const char *val, bool is_list)
 731 {
 732         unsigned int w = 0;
 733         char *p, *s;
 734
 735         if (*val == '!')
 736         {
 737                 fw3_setbit(*(uint8_t *)ptr, 0);
 738                 while (isspace(*++val));
 739         }
 740
 741         if (!(s = strdup(val)))
 742                 return false;
 743
 744         for (p = strtok(s, " \t"); p; p = strtok(NULL, " \t"))
 745         {
 746                 if (!parse_enum(&w, p, weekdays, 1, 7))
 747                 {
 748                         w = strtoul(p, &p, 10);
 749
 750                         if (*p || w < 1 || w > 7)
 751                         {
 752                                 free(s);
 753                                 return false;
 754                         }
 755                 }
 756
 757                 fw3_setbit(*(uint8_t *)ptr, w);
 758         }
 759
 760         free(s);
 761         return true;
 762 }
 763
 764 bool
 765 fw3_parse_monthdays(void *ptr, const char *val, bool is_list)
 766 {
 767         unsigned int d;
 768         char *p, *s;
 769
 770         if (*val == '!')
 771         {
 772                 fw3_setbit(*(uint32_t *)ptr, 0);
 773                 while (isspace(*++val));
 774         }
 775
 776         if (!(s = strdup(val)))
 777                 return false;
 778
 779         for (p = strtok(s, " \t"); p; p = strtok(NULL, " \t"))
 780         {
 781                 d = strtoul(p, &p, 10);
 782
 783                 if (*p || d < 1 || d > 31)
 784                 {
 785                         free(s);
 786                         return false;
 787                 }
 788
 789                 fw3_setbit(*(uint32_t *)ptr, d);
 790         }
 791
 792         free(s);
 793         return true;
 794 }
 795
 796 bool
 797 fw3_parse_include_type(void *ptr, const char *val, bool is_list)
 798 {
 799         return parse_enum(ptr, val, include_types,
 800                           FW3_INC_TYPE_SCRIPT, FW3_INC_TYPE_RESTORE);
 801 }
 802
 803 bool
 804 fw3_parse_reflection_source(void *ptr, const char *val, bool is_list)
 805 {
 806         return parse_enum(ptr, val, reflection_sources,
 807                           FW3_REFLECTION_INTERNAL, FW3_REFLECTION_EXTERNAL);
 808 }
 809
 810 bool
 811 fw3_parse_mark(void *ptr, const char *val, bool is_list)
 812 {
 813         uint32_t n;
 814         char *s, *e;
 815         struct fw3_mark *m = ptr;
 816
 817         if (*val == '!')
 818         {
 819                 m->invert = true;
 820                 while (isspace(*++val));
 821         }
 822
 823         if ((s = strchr(val, '/')) != NULL)
 824                 *s++ = 0;
 825
 826         n = strtoul(val, &e, 0);
 827
 828         if (e == val || *e)
 829                 return false;
 830
 831         m->mark = n;
 832         m->mask = 0xFFFFFFFF;
 833
 834         if (s)
 835         {
 836                 n = strtoul(s, &e, 0);
 837
 838                 if (e == s || *e)
 839                         return false;
 840
 841                 m->mask = n;
 842         }
 843
 844         m->set = true;
 845         return true;
 846 }
 847
 848 bool
 849 fw3_parse_setmatch(void *ptr, const char *val, bool is_list)
 850 {
 851         struct fw3_setmatch *m = ptr;
 852         char *p, *s;
 853         int i;
 854
 855         if (*val == '!')
 856         {
 857                 m->invert = true;
 858                 while (isspace(*++val));
 859         }
 860
 861         if (!(s = strdup(val)))
 862                 return false;
 863
 864         if (!(p = strtok(s, " \t")))
 865         {
 866                 free(s);
 867                 return false;
 868         }
 869
 870         strncpy(m->name, p, sizeof(m->name));
 871
 872         for (i = 0, p = strtok(NULL, " \t,");
 873              i < 3 && p != NULL;
 874              i++, p = strtok(NULL, " \t,"))
 875         {
 876                 if (!strncmp(p, "dest", 4) || !strncmp(p, "dst", 3))
 877                         m->dir[i] = "dst";
 878                 else if (!strncmp(p, "src", 3))
 879                         m->dir[i] = "src";
 880         }
 881
 882         free(s);
 883
 884         m->set = true;
 885         return true;
 886 }
 887
 888 bool
 889 fw3_parse_direction(void *ptr, const char *val, bool is_list)
 890 {
 891         bool *is_out = ptr;
 892         bool valid = true;
 893
 894         if (!strcmp(val, "in") || !strcmp(val, "ingress"))
 895                 *is_out = false;
 896         else if (!strcmp(val, "out") || !strcmp(val, "egress"))
 897                 *is_out = true;
 898         else
 899                 valid = false;
 900
 901         return valid;
 902 }
 903
 904 bool
 905 fw3_parse_cthelper(void *ptr, const char *val, bool is_list)
 906 {
 907         struct fw3_cthelpermatch m = { };
 908
 909         if (*val == '!')
 910         {
 911                 m.invert = true;
 912                 while (isspace(*++val));
 913         }
 914
 915         if (*val)
 916         {
 917                 m.set = true;
 918                 strncpy(m.name, val, sizeof(m.name) - 1);
 919                 put_value(ptr, &m, sizeof(m), is_list);
 920                 return true;
 921         }
 922
 923         return false;
 924 }
 925
 926 bool
 927 fw3_parse_setentry(void *ptr, const char *val, bool is_list)
 928 {
 929         struct fw3_setentry e = { };
 930
 931         e.value = val;
 932         put_value(ptr, &e, sizeof(e), is_list);
 933
 934         return true;
 935 }
 936
 937
 938 bool
 939 fw3_parse_options(void *s, const struct fw3_option *opts,
 940                   struct uci_section *section)
 941 {
 942         char *p, *v;
 943         bool known, inv;
 944         struct uci_element *e, *l;
 945         struct uci_option *o;
 946         const struct fw3_option *opt;
 947         struct list_head *dest;
 948         bool valid = true;
 949
 950         uci_foreach_element(&section->options, e)
 951         {
 952                 o = uci_to_option(e);
 953                 known = false;
 954
 955                 for (opt = opts; opt->name; opt++)
 956                 {
 957                         if (!opt->parse)
 958                                 continue;
 959
 960                         if (strcmp(opt->name, e->name))
 961                                 continue;
 962
 963                         if (o->type == UCI_TYPE_LIST)
 964                         {
 965                                 if (!opt->elem_size)
 966                                 {
 967                                         warn_elem(e, "must not be a list");
 968                                         valid = false;
 969                                 }
 970                                 else
 971                                 {
 972                                         dest = (struct list_head *)((char *)s + opt->offset);
 973
 974                                         uci_foreach_element(&o->v.list, l)
 975                                         {
 976                                                 if (!l->name)
 977                                                         continue;
 978
 979                                                 if (!opt->parse(dest, l->name, true))
 980                                                 {
 981                                                         warn_elem(e, "has invalid value '%s'", l->name);
 982                                                         valid = false;
 983                                                         continue;
 984                                                 }
 985                                         }
 986                                 }
 987                         }
 988                         else
 989                         {
 990                                 v = o->v.string;
 991
 992                                 if (!v)
 993                                         continue;
 994
 995                                 if (!opt->elem_size)
 996                                 {
 997                                         if (!opt->parse((char *)s + opt->offset, o->v.string, false))
 998                                         {
 999                                                 warn_elem(e, "has invalid value '%s'", o->v.string);
1000                                                 valid = false;
1001                                         }
1002                                 }
1003                                 else
1004                                 {
1005                                         inv = false;
1006                                         dest = (struct list_head *)((char *)s + opt->offset);
1007
1008                                         for (p = strtok(v, " \t"); p != NULL; p = strtok(NULL, " \t"))
1009                                         {
1010                                                 /* If we encounter a sole "!" token, assume that it
1011                                                  * is meant to be part of the next token, so silently
1012                                                  * skip it and remember the state... */
1013                                                 if (!strcmp(p, "!"))
1014                                                 {
1015                                                         inv = true;
1016                                                         continue;
1017                                                 }
1018
1019                                                 /* The previous token was a sole "!", rewind pointer
1020                                                  * back by one byte to precede the value with an
1021                                                  * exclamation mark which effectively turns
1022                                                  * ("!", "foo") into ("!foo") */
1023                                                 if (inv)
1024                                                 {
1025                                                         *--p = '!';
1026                                                         inv = false;
1027                                                 }
1028
1029                                                 if (!opt->parse(dest, p, true))
1030                                                 {
1031                                                         warn_elem(e, "has invalid value '%s'", p);
1032                                                         valid = false;
1033                                                         continue;
1034                                                 }
1035                                         }
1036
1037                                         /* The last token was a sole "!" without any subsequent
1038                                          * text, so pass it to the option parser as-is. */
1039                                         if (inv && !opt->parse(dest, "!", true))
1040                                         {
1041                                                 warn_elem(e, "has invalid value '%s'", p);
1042                                                 valid = false;
1043                                         }
1044                                 }
1045                         }
1046
1047                         known = true;
1048                         break;
1049                 }
1050
1051                 if (!known)
1052                         warn_elem(e, "is unknown");
1053         }
1054
1055         return valid;
1056 }
1057
1058
1059 bool
1060 fw3_parse_blob_options(void *s, const struct fw3_option *opts,
1061                        struct blob_attr *a, const char *name)
1062 {
1063         char *p, *v, buf[16];
1064         bool known;
1065         unsigned rem, erem;
1066         struct blob_attr *o, *e;
1067         const struct fw3_option *opt;
1068         struct list_head *dest;
1069         bool valid = true;
1070
1071         blobmsg_for_each_attr(o, a, rem)
1072         {
1073                 known = false;
1074
1075                 for (opt = opts; opt->name; opt++)
1076                 {
1077                         if (!opt->parse)
1078                                 continue;
1079
1080                         if (strcmp(opt->name, blobmsg_name(o)))
1081                                 continue;
1082
1083                         if (blobmsg_type(o) == BLOBMSG_TYPE_ARRAY)
1084                         {
1085                                 if (!opt->elem_size)
1086                                 {
1087                                         fprintf(stderr, "%s: '%s' must not be a list\n",
1088                                                 name, opt->name);
1089
1090                                         valid = false;
1091                                 }
1092                                 else
1093                                 {
1094                                         dest = (struct list_head *)((char *)s + opt->offset);
1095
1096                                         blobmsg_for_each_attr(e, o, erem)
1097                                         {
1098                                                 if (blobmsg_type(e) == BLOBMSG_TYPE_INT32) {
1099                                                         snprintf(buf, sizeof(buf), "%d", blobmsg_get_u32(e));
1100                                                         v = buf;
1101                                                 } else {
1102                                                         v = blobmsg_get_string(e);
1103                                                 }
1104
1105                                                 if (!opt->parse(dest, v, true))
1106                                                 {
1107                                                         fprintf(stderr, "%s: '%s' has invalid value '%s'\n",
1108                                                                 name, opt->name, v);
1109                                                         valid = false;
1110                                                         continue;
1111                                                 }
1112                                         }
1113                                 }
1114                         }
1115                         else
1116                         {
1117                                 if (blobmsg_type(o) == BLOBMSG_TYPE_INT32) {
1118                                         snprintf(buf, sizeof(buf), "%d", blobmsg_get_u32(o));
1119                                         v = buf;
1120                                 } else {
1121                                         v = blobmsg_get_string(o);
1122                                 }
1123
1124                                 if (!v)
1125                                         continue;
1126
1127                                 if (!opt->elem_size)
1128                                 {
1129                                         if (!opt->parse((char *)s + opt->offset, v, false))
1130                                         {
1131                                                 fprintf(stderr, "%s: '%s' has invalid value '%s'\n",
1132                                                         name, opt->name, v);
1133                                                 valid = false;
1134                                         }
1135                                 }
1136                                 else
1137                                 {
1138                                         dest = (struct list_head *)((char *)s + opt->offset);
1139
1140                                         for (p = strtok(v, " \t"); p != NULL; p = strtok(NULL, " \t"))
1141                                         {
1142                                                 if (!opt->parse(dest, p, true))
1143                                                 {
1144                                                         fprintf(stderr, "%s: '%s' has invalid value '%s'\n",
1145                                                                 name, opt->name, p);
1146                                                         valid = false;
1147                                                         continue;
1148                                                 }
1149                                         }
1150                                 }
1151                         }
1152
1153                         known = true;
1154                         break;
1155                 }
1156
1157                 if (!known && strcmp(blobmsg_name(o), "type"))
1158                         fprintf(stderr, "%s: '%s' is unknown\n", name, blobmsg_name(o));
1159         }
1160
1161         return valid;
1162 }
1163
1164
1165 const char *
1166 fw3_address_to_string(struct fw3_address *address, bool allow_invert, bool as_cidr)
1167 {
1168         char *p, ip[INET6_ADDRSTRLEN];
1169         static char buf[INET6_ADDRSTRLEN * 2 + 2];
1170
1171         p = buf;
1172
1173         if (address->invert && allow_invert)
1174                 p += sprintf(p, "!");
1175
1176         inet_ntop(address->family == FW3_FAMILY_V4 ? AF_INET : AF_INET6,
1177                   &address->address.v4, ip, sizeof(ip));
1178
1179         p += sprintf(p, "%s", ip);
1180
1181         if (address->range)
1182         {
1183                 inet_ntop(address->family == FW3_FAMILY_V4 ? AF_INET : AF_INET6,
1184                           &address->mask.v4, ip, sizeof(ip));
1185
1186                 p += sprintf(p, "-%s", ip);
1187         }
1188         else if (!as_cidr)
1189         {
1190                 inet_ntop(address->family == FW3_FAMILY_V4 ? AF_INET : AF_INET6,
1191                           &address->mask.v4, ip, sizeof(ip));
1192
1193                 p += sprintf(p, "/%s", ip);
1194         }
1195         else
1196         {
1197                 p += sprintf(p, "/%u", fw3_netmask2bitlen(address->family,
1198                                                           &address->mask.v6));
1199         }
1200
1201         return buf;
1202 }